Disk grinder



J. MILLER, JR

DISK GRINDER 2` Smets-sheet 1 Filed Jan. 16, 1920 ne QN m 9N 2, u f 2 h s Q m/f y un m /m w J fa@ R w JW. @if Lm` mx@ MHJ .Dd J m m.. o

Apr, i?, i923.

Patented Apr. 17, 1923.

JOHN MILLER, JR., OF BELGIE?, WISCONSIN, ASSIGNOR TO CHARLES H. BESLY c COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DISK GRINDER.

Application led January 1G, 1920.

To all whom it may concern:

Be it known that l, JOHN MILLER, Jr., a citizen of the United States, and a resident of Beloit, in the county of Rock and State of llVisconsin, have invented certain new and useful Improvements in Disk Grinders, of which the following is a specification.

This invention relates to improvements in disk grinders and more particularly to a novel Yconstruction for a disk grinder' of the horizontal type embodying certain improved features pertaining to those 'parts designed to accomplish the removal of the dust and particles of material resulting from the grinding operation.

The object of the invention is to provide `an improved structure calculated to overcome the disadvantages of the construction now commonly employed. thereby producing a more efficient anddesirable machine. A disk lgrinder of the horizontal type has been heretofore constructed to include what is known as a dust ring, namely. a hollow ring made up of one or more hollow sections of cast metal which surrounds the periphery of the disk. said sections being provided with a series of apertures or slots arranged along the side thereof adjacent the disk. -Tlie passages and slots of the rings were produced by the use of cores, and as a result the passages were rough, uneven,y and varying in cross-sectional area, and the slots necessarily not of uniform width and distribution. The use of exhaust rings was found to be `objectionable in that it was difficult to maintain a uniform suction at all points of the periphery of the disk and hence there was i imperfect removal of the dust.

By constructing a machinerin the manner hereinafter pointed out and as embodied in the invention, it is possible to not only eliminate the use of a cast metal exhaust ring but to completely overcome the imperfections of its use. The features embodied in the invention are hereinafter fully set forth and illustrated in the accompanying draw ings, in which- Fig. 1 is a view in side elevation of a disk grinder constructed in accordance with the invention,

F ig. 2 is a top plan view of the grinder, and

Fig. 3 is a detail view in cross section of the grinder showing the construction of the exhaust chamber and slot.

Serial N0. 351,759.

The drawings illustrate a disk grinder of the horiaontal type ordinarily employed in the finishing of small castings and the like, the same comprising a cylindric-shaped bas or pedestal 1 which preferably rests upon a base. plate 2. The pedestal l is a hollow casting within which is enclosed a vertical spindle 3 mounted in bearings at t and 5, the spindle extending upwardly through the upper wall 6 of the pedestal in which is mounted the spindle bearing 5. Upon the upper end of the spindle 8 is mounted the lgrinding disk 7, the same comprising a fiat circular metal disk to the upper face of which is applied a sheet or abrasive material.

The spindle and disk are rotated or driven by suitable mechanism consisting of a horiaontal drive shaft 8 which extends into the interior of the pedestal and has driving connection with the spindle through the medium of miter gears 9 and 10 iiXed to the shaft and spindle respectively. The drive shaft 8 is supported adjacent its outer end in a bearing- 11 and at its inner end in a bearing 12 supported by the pedestal 1. On the shaft 8 are mounted loose and fixed pulleys 13 and 14 respectively, adapted to carryia belt. there being employed the usual form of belt shifter 15 and lever 16.

Referring more in detail to the structure of the grinder and those parts to which my invention relates there is mounted upon the upper end of the pedestal a body member 17 having the shape of a shallow inverted frusto-conical shell interposed between the pedestal 1 and the disk 7. This body menr ber is of cast metal having a base or bottom wall 18 resting on and secured to the pedestal 1 and outwardly and upwardly inclined 9 or tapered walls 19 terminating in an annular iiange 20 surrounding theperiphery of the disk 7 and lying substantially in the plane of said disk, or, as clearly shown in Fig. 3, the upper face of the flange is slightly below the plane of the under face of said disk. Mounted upon the flange 20 of the body member is a ring 21 of L-section which is secured in place by means of bolts said ring projecting above the-surface of the disk and acting as a surrounding wall to maintain the articles or parts upon the revolving disk.

As a preferable construction the inner an nular surface of the flange 20 of the body member is finished or machined to provide a coating of and accurately machined at its periphery.

Thus rit is obviousthat there is provided a slot extending completely around the disk, said slot being `formed between two accu rately machined or finished surfaces of the body and the disk. The slot communicates with the exhaust chamber formedbctween the under surface of the disk 'ilitheportion ofthe wall 19 below the disk and a vertical yannular' partition wall 19mrformedintegral with the body 17 adjacent the base 18. The dust is drawn through the slot as it is impelled outwardly:tot-heedge of the disk by centrifugal action or yby `the suction produced within the chamber or interior of the .body by means ofan exhausting apparatus, V.preferably 1n the form of a` blower 24 mounted adjacentito the pedestal and driven by a belt from the main drive shaft 8,

and apulley 26 carried by said shaft. IFro-m `the blower 25 there extends an exhaust pipe 27 which communicates with the interior of .the chamber .at two diametrically disposed outlet connections 28 and 29, the exhaust pipe being curved in order to hug closely thepedestal 1, and being lgradually reduced in diameteras it approaches the more distant exhaust outlet 29. The operation of the blower obviously exhausts the air from the interior of the chamber, carrying with it the `dust that is drawn through the slot.

Amongthe features of the construction employed there maybe pointed out the location fof the dust exhaust chamber ,and the manner 4.in which it is formed, it being ob- Aserved that the same is located completely beneath the disk andhence removed from those 4.portions of the machine that should 'be freelyaccessible in the opera-tion thereof.

lt is to be observed that [in forming the chamber a part of the machine is utilized which otherwise is pratically wasted, -by

providing a body member immediately beneath the disk, which member isa simple `form of casting in which no cored .passages or openings are necessary. A further feature to be noted is the employment ,of the disk itself as a wall or top closure of the chamber whereby the parts forming the chamber are reduced to a minimum, all of which aids in the production of a. lighter, simpler and more eiiicient machine.

1n like manner the formation of the slot between the accurately machined surfaces of the body member and the disk itself promotes the ejfliciency of the machine by providing a continuous, uniform slot for the removal of the dust without the presence of added parts designed for this particular purpose. By this arrangement not only is the weight of the machine and its manufacture simplified but the efficiency of the exhausting apparatus materially increasedby the production off an accurately formed slot between two finished' 'surfaces vwhich is obviously impossible to produce in a cast or cored dust removing member as for instance, an exhaust ring.

These Lfea-tures of construction unite to produce a more eflicient machine of simpler and less expensive construction, in the production of labor-saving machinery.

Although I have described and illustrated a definite embodimentof 4the invention` the details thereof may obviously be modied without departing from the spirit of the invention, and therefore I do not wish .to be limited except in so far as the invention .is

`specifically set forth in theappended-claim. V

l claim as my invention.:

In a grinding machine, the combination of a pedestal' including a flaring' wall portion and a vertical partition wall, a spindlezj ournailed in said pedestal, having 4a disk mountedfat theupper end.- thereof, said flaring wall portion'having afinished marginal surface spaced below the under-.side of said disk, and forming therewith .a slot,V communicating with an exhaust chamber formed betweenl said disk, flaringwall portion and vertical partition wall, anda dust ring secured to the marginal por-tion of said'flared wall portionand spacedradially from the edge of said disk.

AIn witness whereof, Ihereunto subscribe my name this 10th day of Jan., A. D., 1920.

JOHN MIELER, Jn. 

